Page F-7
Repair and Service Manual
B
B
ELECTRONIC SPEED CONTROL - TCT
Read all of Section B and this section before attempting any procedure. Pay particular attention to Notices, Cautions, Warnings and Dangers.
Fig. 7 Controller Faults and Troubleshooting
Controller Fault Responses
1 - Reduce Armature duty cycle to zero.
2 - Reduce Field current to zero
3 - Turn off Main Contactor
4 - “Limp Home” in slow speed. Armature Duty Cycle = 75% Max, Field Min = 10.0 Amps
5 - Gradual reduction in armature Drive current limit
6 - Quickly reduce armature duty cycle to zero until speed sensor pulses reappear
7 - Gradual Reduction in Regen Current Limit
8 - Internal Scaled Throttle Signal set to Zero
9 - Commence Walk-Away Function
HPD (HIGH PEDAL
DISABLE)
High Pedal Disable
Controller powers up
with Key, Direction and
Throttle applied OR
Throttle applied before
Key and Direction
switch applied
KSI ON, Forward or
Reverse ON
8
Throttle < 25%
1. Incorrect sequence of Vehicle input
controls
2. Defective Throttle device
THERMAL
CUTBACK
Over/Under
Temperature Cutback
Continuous
5
Condition clears
1. Temperature >85°C or < -25°C
2. Excessive load on vehicle
3. Improper mounting of controller
4. Operation in extreme environment
OVERVOLTAGE
Battery Voltage >
OVERVOLTAGE MIN
parameter
Continuous
7
Condition clears
1. Battery Voltage > Shutdown limit
LOW BATTERY
VOLTAGE
Battery Voltage < LOW
VOLTAGE MAX
parameter
Continuous
5
Condition clears
1. Battery Voltage < Cutback Limit
2. Corroded Battery Terminal
3. Loose Battery or Controller terminal
THROTTLE FAULT
Throttle Input Fault
Continuous
8
Condition clears
1. Throttle wiring open or shorted
2. Defective Throttle device
1311 Display
Explanation
Tested When
Controller
Response
Recover
When
Possible Cause
